273 rocker arm adjustment
ok here is a couple more pictures, when i first read RR's method it sounded like he was running the drill bit through the two push rod holes (using those two holes like a drill guide)
I think my drawing got a little wonky and i was confused about RR's picture because the two files he stuck in the rocker arm holes were at two different angles, but i think that was just because the file handles fit loose in the holes and he was just making a demonstration?
anyway, here is a drill bit that fits nice and tight, and it makes a straight shot to the other side, see how i lined up the drill bit with the ruler with the circle square tool.